On Oct 17, 2010, at 6:17 AM, Edward Ned Harvey wrote: >> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- >> boun...@opensolaris.org] On Behalf Of Edward Ned Harvey >> >> If scrub is operating at a block-level (and I think it is), then how >> can >> checksum failures be mapped to file names? For example, this is a >> long-requested feature of "zfs send" which is fundamentally difficult >> or >> impossible to implement. > > How about that. I recently learned that "zfs diff" does exist already, in > b147 of openindiana. That means it's already in the oracle opened-source > zfs code, but apparently too new to be included in any of the present > releases. > > So it seems, zfs does have some ability to figure out which file owns a > particular block on disk.
uhm... of course this exists. The problem is that the efficient mapping goes the other way: files to blocks. Snapshots further complicate this because a block may belong to a filename in one snapshot but the file got renamed in another snapshot. Deduplication also complicates this because a block may be referenced in multiple files. Maintaining this mapping live is probably not worth the effort. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
